Lagerstroemia plant named ‘Milarosso’

ABSTRACT

A new cultivar of  Lagerstroemia  indica plant named ‘Milarosso’ that is characterized by its well-branched plant habit, its early and long lasting bloom period, its flowers that are dark pink in color, its good tolerance to powdery mildew, and its good frost resistance.

Botanical classification: Lagerstroemia indica.

Variety denomination: ‘Milarosso’.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is co-pending with a U.S. Plant Patent Applications filed for plants derived from the Inventor's breeding program that are entitled Lagerstroemia Plant Named ‘Milavio’ (U.S. Plant patent application Ser. No. 14/544,052), ‘Milarosa’ (U.S. Plant patent application Ser. No. 14/544,051), ‘Milabla’ (U.S. Plant patent application Ser. No. 14/544,046), and ‘Milaperl’ (U.S. Plant patent application Ser. No. 14/544,053).

BACKGROUND OF THE INVENTION

The present invention relates to a new and distinct cultivar of Lagerstroemia indica. The new Lagerstroemia will hereafter by its cultivar name, ‘Milarosso’. ‘Milarosso’ is a new cultivar of deciduous shrub grown for use as an ornamental landscape plant.

The new cultivar of Lagerstroemia is the result of a controlled breeding program conducted by the Inventor in Vertemate con Minoprio, Italy. ‘Milarosso’ originated as a seedling that arose from seeds that were pooled and sown in 1998 from open pollination of 33 unnamed and unpatented proprietary plants in the Inventor's breeding program, designated as breeding line No. 53.31. ‘Milarosso’ was selected as a single unique plant in 1999 from amongst the resulting seedlings. The exact parent plants are unknown.

Asexual propagation of the new cultivar was first accomplished by the Inventor using stem cuttings in 1999 in Vertemate con Minoprio, Italy. Asexual propagation by stem cuttings has determined that the characteristics of the new cultivar are stable and are reproduced true to type in successive generations.

SUMMARY OF THE INVENTION

The following traits have been repeatedly observed and represent the characteristics of the new cultivar. These attributes in combination distinguish ‘Milarosso’ as a unique cultivar of Lagerstroemia.

-   -   1. ‘Milarosso’ exhibits a well-branched plant habit.     -   2. ‘Milarosso’ exhibits an early and long lasting bloom period;         flowering from the end of June to the end of August in Northern         Italy.     -   3. ‘Milarosso’ exhibits flowers that are dark pink in color.     -   4. ‘Milarosso’ exhibits good tolerance to powdery mildew.     -   5. ‘Milarosso’ exhibits good frost resistance; withstanding         temperatures at least as low as −15° C.         ‘Milarosso’ can be most closely compared to Lagerstroemia indica         cultivars ‘Milabla’, ‘Milaperl’, ‘Milarosa’, and ‘Milavio’.         ‘Milabla’ differs from ‘Milarosso’ in having flowers that are         white in color. ‘Milaperl’ differs from ‘Milarosso’ in having         flowers that are pale pink in color. ‘Milarosa’ differs from         ‘Milarosso’ in having flowers that open light pink in color and         mature to a deeper pink. ‘Milavio’ differs from ‘Milarosso’ in         having flowers that are violet in color.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying colored photographs illustrate the overall appearance and distinct characteristics of the new Lagerstroemia. The photographs were taken of a plant two years in age as grown outdoors in a 2-liter container in Zundert, The Netherlands.

The photograph in FIG. 1 provides a side view of ‘Milarosso’ in bloom.

The photograph in FIG. 2 provides a close-up view of inflorescences of ‘Milarosso’.

The photograph in FIG. 3 provides a close-up view of the foliage of ‘Milarosso’.

The colors in the photographs are as close as possible with the digital photography techniques available, the color values cited in the detailed botanical description accurately describe the colors of the new Lagerstroemia.

DETAILED BOTANICAL DESCRIPTION

The descriptions were taken of plants two years in age as grown outdoors in 2-liter containers in Zundert, The Netherlands. The phenotype of the new cultivar may vary with variations in environmental, climatic, and cultural conditions, as it has not been tested under all possible environmental conditions. The color determination is in accordance with The 2007 R.H.S. Colour Chart of The Royal Horticultural Society, London, England, except where general color terms of ordinary dictionary significance are used.

-   General description:     -   -   Blooming period.—From the end of June through the end of             August in Northern Italy.         -   Plant type.—Deciduous shrub.         -   Plant habit.—Upright and well-branched.         -   Height and spread.—An average of 40.0 cm in height and 44.5             cm in spread at two years of age in a 2-liter container.         -   Cold hardiness.—At least to U.S.D.A. Zone 8a.         -   Diseases and pests.—Good tolerance to powdery mildew caused             by Erysiphe lagerstroemia has been observed.         -   Root description.—Fibrous and fine.         -   Root development.—Roots in 6 weeks and fully develops in a             9-cm container in about 4 months.         -   Growth rate.—Moderate. -   Stem description:     -   -   Shape.—Quadrangulate with rounded wings.         -   Stem color.—N199C with wings N170A.         -   Stem size.—An average of 22.2 cm in length and 3 mm in             diameter.         -   Stem surface.—Slightly glossy.         -   Stem strength.—Strong.         -   Branching.—An average of 15 lateral branches, freely             branching.         -   Internode length.—An average of 2.6 cm. -   Foliage description:     -   -   Leaf shape.—Ovate to elliptic.         -   Leaf division.—Single.         -   Leaf base.—Attenuate.         -   Leaf apex.—Acute to broadly acute.         -   Leaf venation.—Pinnate, color; upper surface 152A and lower             surface 147C.         -   Leaf margins.—Entire.         -   Leaf arrangement.—Opposite.         -   Leaf attachment.—Petiolate.         -   Leaf surface.—Both surfaces glabrous and moderately glossy.         -   Leaf size.—An average of 4.3 cm in length and 2.7 cm in             width.         -   Leaf quantity.—An average of 18 (9 pairs) per branch.         -   Leaf color.—Young leaves upper surface; 144A, young leaves             lower surface; 146C to 146D, mature growth upper surface; a             blend between 146A and 147B tinged with 184A at the margins,             mature growth lower surface 147C tinged with 184A at the             margins.         -   Leaf fragrance.—Fragrance typical for Lagerstroemia detected             when touched.         -   Petioles.—An average of 1 mm in length and width and 147C in             color, slightly glossy surface. -   Flower description:     -   -   Inflorescence type.—Terminal thyrse.         -   Lastingness of inflorescence.—About one week.         -   Inflorescence size.—An average of 9.9 cm in height and 10.0             cm in width.         -   Inflorescence number.—An average of 5 per lateral stem.         -   Flower number.—An average of 30 flowers per inflorescence.         -   Flower fragrance.—Faint sweet scent.         -   Flower buds.—Globular in shape, an average of 7.5 mm in             diameter and 8 mm in depth, glabrous surface, color; 145B             suffused with 174B, 199C to 199D at apex.         -   Flower aspect.—Upright to outward.         -   Flower type.—Rotate.         -   Flower size.—An average of 4.8 cm in diameter and 2.3 mm in             depth.         -   Petals.—An average of 6, reniform in shape, strongly             undulate bidentate margins, stalked base, praemorse apex,             both surfaces glabrous and dull, an average of 2.2 cm in             length and 1.3 cm in width, color when opening upper and             lower surface 67C with stalk 60C, color when fully open             upper and lower surface; 68A with stalk 60C, petal color             does not fade.         -   Calyx.—Rotate in shape, an average of 1.1 cm in length and             1.2 cm in diameter.         -   Sepals.—An average of 6 petals, rotate arrangement, fused at             base, rhomboidal in shape, entire margins, acuminate apex,             both surfaces smooth and dull, an average of 1.1 mm in             length and 4 mm in width, color; upper surface when opening             and when fully open 150C strongly suffused with 180A to 180B             at base, lower surface when opening and when fully open 174B             with top half 199D.         -   Peduncles.—Strong, an average of 4.6 cm in length and 0.2 mm             in width, 177D in color, surface is slightly glossy, main             peduncles held at an average angle of 0° to the lateral             branch, secondary peduncles held at an average angle of 30°             to the lateral branch.         -   Pedicels.—Strong, an average of 8 mm in length and 1 mm in             width, 152D in color, surface is slightly glossy, main             pedicels held at an average angle of 0° to the lateral             branch, secondary pedicels held at an average angle of 30°             to the lateral branch. -   Reproductive organs:     -   -   Stamens.—Average of 40, anther; an average of 2 mm in             length, dorsifixed, narrow oblong in shape, 165B in color,             filament; an average of 1.2 cm in length and 145D in color,             pollen is moderate in quantity and 9B in color.         -   Pistils.—An average of 1, an average of 1.9 cm in length,             style; an average of 1.8 cm in length and 176B in color,             stigma is club-shaped and 166A to 166B in color, ovary is             151D in color.         -   Seed and fruit.—None observed. 

It is claimed:
 1. A new and distinct cultivar of Lagerstroemia plant named ‘Milarosso’ as herein illustrated and described. 